Flame damper and muffler



Patented May 20, 1947 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to a flame damper and muffler.

The invention has been particularly designed for use on aircraft for extinguishing the flame from the motor so that the aircraft will not be a visible target at night.

An object of the invention is to provide a ame damper, and muler being provided with a plurality of transverse vanes so arranged that they will intercept the stream of gas, supporting the fiame and will disintegrate the flame and completely extinguish the same before it emerges from the damper.

Another object of the invention is to provide a flame damper and muffier embodyng a housing, or jacket, having a polygonal inside surface With a series of rings fitted into the housing, each ring having transverse vanes, set at a suitable angle therein with the vanes of each ring being staggered with respect to those of adjacent rings Whereby the exhaust gases will be divided and not allowed to flow in a continuous stream so that the flame will be extinguished before the exhaust gases emerge.

While the invention has been particularly designed for use on aircrait, it is to be understood that it is also adaptable for use on internal combustion motors generally.

With the above and other objects in View, the invention has particular relation to certain novel features of Construction, arrangement of parts and use, an example of which is given in this specication and illustrated in the accompanying drawings, wherein:

Figure 1 shows a longitudinal sectional View of the housing showing an elevational View of the rings therein.

Figure 2 shows a cross sectional View taken on the line 2-2 of Figure 1.

Figure 3 shows a plan View of the ring and vane assembly, and

Figure 4 shows a elevational view thereof.

Referring now more particularly to the drawings wherein like numerals of reference designate the same parts in each of the figures, the numeral l designates a cylindrical jacket having an annular inside ledge, or shoulder, '2 at one end.

As clearly shown in Figure 2, this jacket has an inside polygonal contour thus presenting longitudinal plane faces 3 extending from end to end thereof.

There is a series of rings 4 fitted into the jacket. The outer surfaces of these rings conform to the inside shape of the jacket and fit closely therein so that the rings cannot turn.

The series of rings is clamped between the shoulder 2 and the inside ring nut 5 which is screwed into the opposite end of the jacket. This last mentioned end of the jacket is to be connected to the exhaust manifold of the motor and is shown as having external threads 6 for that purpose, although other attaching means may be provided.

Each ring may have a plurality of vanes as i, 8. Preferably, there are two vanes for each ring and the vanes of one ring are off-set, or staggered, with respect to the vanes of the next succeeding ring as illustrated in Figures 1 and 2. The vanes are pitched or inclined relative tothe axis of the jacket. As shown in Figures 2 and 3; they are correspcndingly pitched but some of the vanes may be pitched in a direction the opposite of that of other of said vanes. This is illustrated in Figure 1.

As illustrated in Figure 3, the stream of gas passing through the jacket will be separated by the vanes 1, 8 and a portion of the stream will be caused to flow by the vane 'I in a direction approximately at right angles to the direction of the flow caused by the vane 8 and these separated streams will be again separated and caused to flow in right angular directions by the vanes of the next succeeding rings and these broken up Currents will intercept each other in their course through the jacket thus mufflng the sound and extinguishing the fiame before it emerges.

The jacket may be made of any desired length depending upon the type and size of the motor.

The fiame damper and mufiler may be rendered more efiicieht by arranging some of the vanes at a reverse pitch or angle to that of other of said vanes as is illustrated in Figura 1.

The general course of the exhaust gases through the jacket is indicated by the arrows in Figures 1 and 2.

The drawings and description are illustrative merely while the broad principle of the invention will be defined by the appended claim.

What I claim is:

A flame damper and muffler comprising a tubular housing, a series of rings fitted into the housing in adjacent relation, a blade like vane extending diametrically across each ring, the ends of said vanes being anchored to the corresponding rings, said vanes being arranged in staggered relation and being inclined relative to the axs of the housing, some of said vanes being inclined in a direction the opposite of that of other 5 of the vanes.

ALONZO L. MOBLEY.

REFEREN CES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date 15 Rognon June 20, 1933 Number Number Number 

